#8-32 Polished 18-8 Stainless Nylon Insert Lock Nuts (12 pcs.)

Diameter: #8
Diameter 2: 3/8"
Thickness: 7/16"
Material: Stainless Steel
Finish: Polished
Driver Type: 11/32" Wrench
Thread Size: 32 (Coarse)
Hardness: 18-8
Nominal Size: #8
Style: Nylon Insert
Type: Lock Nut

Box of 12.

A lock nut is a nut that resists loosening under vibrations and torque.